Speedo Essential Endurance Jammers - AW18 Mix inc Polyamide and Elastane Endurance+ Fabric - Protects against fading and retains the garments original shape. Chlorine Resistant - Ensures your swimwear wont degrade. Integral Support - Hugs the contours of the body. Four-Way Stretch - Enhances movement. Drawstring Waist - Provide an optimum fit.